Pixel and driving method thereof

Abstract

A pixel includes a first electrode, a second electrode and a third electrode. The first electrode and the second electrode are formed on a lower substrate. The third electrode is formed on an upper substrate and above a position between the first and second electrodes. Liquid crystals are formed between the upper and lower substrates. A method for driving the pixel includes providing a first data voltage to the first electrode, providing a second data voltage to the second electrode, and providing a common voltage to the third electrode. The common voltage is substantially the mean value of the first and second data voltages.

What is claimed is: 
     
         1 . A driving method of a pixel, the pixel comprising a first electrode, a second electrode and a third electrode, the first electrode and the second electrode being formed on a lower substrate, the third electrode being formed on an upper substrate and above a position between the first and second electrodes, liquid crystals being formed between the upper and lower substrates, the driving method comprising:
 providing a first data voltage to the first electrode;   providing a second data voltage to the second electrode; and   providing a common voltage to the third electrode;   wherein the common voltage is substantially a mean value of the first and second data voltages.   
     
     
         2 . The driving method of  claim 1  further comprising:
 providing a third data voltage to the first electrode; and 
 providing a fourth data voltage to the second electrode; 
 wherein the common voltage is substantially a mean value of the third and fourth data voltages, the first and fourth data voltages are higher than the common voltage, and the second and third data voltages are lower than the common voltage. 
 
     
     
         3 . The driving method of  claim 2 , wherein:
 providing the first data voltage to the first electrode, is providing the first data voltage to the first electrode in an Nth frame;   providing the second data voltage to the second electrode, is providing the second data voltage to the second electrode in the Nth frame;   providing the third data voltage to the first electrode, is providing the third data voltage to the first electrode in an (N+1)th frame; and   providing the fourth data voltage to the second electrode, is providing the fourth data voltage to the second electrode in the (N+1)th frame;   wherein N is a positive integer.   
     
     
         4 . A driving method of a pixel, the pixel comprising a first electrode, a second electrode and a third electrode, the first electrode and the second electrode being formed on a lower substrate, the third electrode being formed on an upper substrate and above a position between the first and second electrodes, liquid crystals being formed between the upper and lower substrates, the driving method comprising:
 providing a first data voltage to the first electrode;   providing a first common voltage to the second electrode, the first common voltage being lower than the first data voltage; and   providing a first mean voltage to the third electrode, the first mean voltage being substantially a mean value of the first data voltage and the first common voltage.   
     
     
         5 . The driving method of  claim 4  further comprising:
 providing a second data voltage to the first electrode; 
 providing a second common voltage to the second electrode, the second common voltage being higher than the second data voltage; and 
 providing a second mean voltage to the third electrode, the second mean voltage being substantially a mean value of the second data voltage and the second common voltage. 
 
     
     
         6 . The driving method of  claim 5 , wherein:
 providing the first data voltage to the first electrode, is providing the first data voltage to the first electrode in an Nth frame;   providing the first common voltage to the second electrode, is providing the first common voltage to the second electrode in the Nth frame;   providing the first mean voltage to the third electrode, is providing the first mean voltage to the third electrode in the Nth frame;   providing the second data voltage to the first electrode, is providing the second data voltage to the first electrode in an (N+1)th frame;   providing the second common voltage to the second electrode, is providing the second common voltage to the second electrode in the (N+1)th frame; and   providing the second mean voltage to the third electrode, is providing the second mean voltage to the third electrode in the (N+1)th frame;   wherein N is a positive integer.   
     
     
         7 . A blue phase pixel, comprising:
 an upper substrate;   a lower substrate, wherein blue phase liquid crystals are formed between the upper and lower substrates;   a first electrode, formed on the lower substrate, for providing a first data voltage in an Nth frame, and providing a third data voltage in an (N+1)th frame;   a second electrode, formed on the lower substrate, for providing a second data voltage in the Nth frame, and providing a fourth data voltage in the (N+1)th frame; and   a third electrode, formed on the upper substrate and above a position between the first and second electrodes, for providing a common voltage;   wherein the common voltage is identical in the Nth frame and the (N+1)th frame, the common voltage is substantially a mean value of the first and second data voltages, the common voltage is substantially a mean value of the third and fourth data voltages, the first and fourth data voltages are higher than the common voltage, the second and third data voltages are lower than the common voltage, and N is a positive integer.   
     
     
         8 . The blue phase pixel of  claim 7 , wherein the first electrode is coupled to a first data line, the second electrode is coupled to a second data line, and the third electrode is coupled to a common voltage source. 
     
     
         9 . The blue phase pixel of  claim 7 , wherein the upper substrate comprises a color filter. 
     
     
         10 . A pixel, comprising:
 an upper substrate;   a lower substrate, wherein liquid crystals are formed between the upper and lower substrates;   a first electrode, formed on the lower substrate, for providing a first data voltage in an Nth frame, and providing a second data voltage in an (N+1)th frame;   a second electrode, formed on the lower substrate, for providing a first common voltage in the Nth frame, and providing a second common voltage in the (N+1)th frame; and   a third electrode, formed on the upper substrate and above a position between the first and second electrodes, for providing a first mean voltage substantially equal to a mean value of the first data voltage and the first common voltage in the Nth frame, and providing a second mean voltage substantially equal to a mean value of the second data voltage and the second common voltage in the (N+1)th frame;   wherein the first common voltage is lower than the first data voltage, the second common voltage is higher than the second data voltage, and N is a positive integer.   
     
     
         11 . The pixel of  claim 10 , wherein:
 the first electrode is coupled to a first data line; and   the second electrode is coupled to a first common voltage source providing the first common voltage, and coupled to a second common voltage source providing the second common voltage in a sequence.   
     
     
         12 . The pixel of  claim 10 , wherein the upper substrate comprises a color filter.